int &f1(int x=0,int y)
{
	return x*y;
}
int *f2(int a;int b=1)
{
	int t=a*b;
	return &t;
}
void main()
{
	const r;
	int &a,*p;
	r=10;
	a=r;
	const char *pc1="dukang";  
	char *const pc2="dukang";
	char const *pc3="dukang";
	const char const*pc4="dukang";
	pc1[2]='t';                 	
	pc2[2]='t';
	pc3[2]='t';
	pc4[2]='t';
	cout<<f1(3);
	cout<<f2(2,3);
}
